( function () {
class VOXLoader extends THREE.Loader {
  load(url, onLoad, onProgress, onError) {
    const scope = this;
    const loader = new THREE.FileLoader(scope.manager);
    loader.setPath(scope.path);
    loader.setResponseType('arraybuffer');
    loader.setRequestHeader(scope.requestHeader);
    loader.load(url, function (buffer) {
      try {
        onLoad(scope.parse(buffer));
      } catch (e) {
        if (onError) {
          onError(e);
        } else {
          console.error(e);
        }

        scope.manager.itemError(url);
      }
    }, onProgress, onError);
  }

  parse(buffer) {
    const data = new DataView(buffer);
    const id = data.getUint32(0, true);
    const version = data.getUint32(4, true);

    if (id !== 542658390 || version !== 150) {
      console.error('Not a valid VOX file');
      return;
    }

    const DEFAULT_PALETTE = [0x00000000, 0xffffffff, 0xffccffff, 0xff99ffff, 0xff66ffff, 0xff33ffff, 0xff00ffff, 0xffffccff, 0xffccccff, 0xff99ccff, 0xff66ccff, 0xff33ccff, 0xff00ccff, 0xffff99ff, 0xffcc99ff, 0xff9999ff, 0xff6699ff, 0xff3399ff, 0xff0099ff, 0xffff66ff, 0xffcc66ff, 0xff9966ff, 0xff6666ff, 0xff3366ff, 0xff0066ff, 0xffff33ff, 0xffcc33ff, 0xff9933ff, 0xff6633ff, 0xff3333ff, 0xff0033ff, 0xffff00ff, 0xffcc00ff, 0xff9900ff, 0xff6600ff, 0xff3300ff, 0xff0000ff, 0xffffffcc, 0xffccffcc, 0xff99ffcc, 0xff66ffcc, 0xff33ffcc, 0xff00ffcc, 0xffffcccc, 0xffcccccc, 0xff99cccc, 0xff66cccc, 0xff33cccc, 0xff00cccc, 0xffff99cc, 0xffcc99cc, 0xff9999cc, 0xff6699cc, 0xff3399cc, 0xff0099cc, 0xffff66cc, 0xffcc66cc, 0xff9966cc, 0xff6666cc, 0xff3366cc, 0xff0066cc, 0xffff33cc, 0xffcc33cc, 0xff9933cc, 0xff6633cc, 0xff3333cc, 0xff0033cc, 0xffff00cc, 0xffcc00cc, 0xff9900cc, 0xff6600cc, 0xff3300cc, 0xff0000cc, 0xffffff99, 0xffccff99, 0xff99ff99, 0xff66ff99, 0xff33ff99, 0xff00ff99, 0xffffcc99, 0xffcccc99, 0xff99cc99, 0xff66cc99, 0xff33cc99, 0xff00cc99, 0xffff9999, 0xffcc9999, 0xff999999, 0xff669999, 0xff339999, 0xff009999, 0xffff6699, 0xffcc6699, 0xff996699, 0xff666699, 0xff336699, 0xff006699, 0xffff3399, 0xffcc3399, 0xff993399, 0xff663399, 0xff333399, 0xff003399, 0xffff0099, 0xffcc0099, 0xff990099, 0xff660099, 0xff330099, 0xff000099, 0xffffff66, 0xffccff66, 0xff99ff66, 0xff66ff66, 0xff33ff66, 0xff00ff66, 0xffffcc66, 0xffcccc66, 0xff99cc66, 0xff66cc66, 0xff33cc66, 0xff00cc66, 0xffff9966, 0xffcc9966, 0xff999966, 0xff669966, 0xff339966, 0xff009966, 0xffff6666, 0xffcc6666, 0xff996666, 0xff666666, 0xff336666, 0xff006666, 0xffff3366, 0xffcc3366, 0xff993366, 0xff663366, 0xff333366, 0xff003366, 0xffff0066, 0xffcc0066, 0xff990066, 0xff660066, 0xff330066, 0xff000066, 0xffffff33, 0xffccff33, 0xff99ff33, 0xff66ff33, 0xff33ff33, 0xff00ff33, 0xffffcc33, 0xffcccc33, 0xff99cc33, 0xff66cc33, 0xff33cc33, 0xff00cc33, 0xffff9933, 0xffcc9933, 0xff999933, 0xff669933, 0xff339933, 0xff009933, 0xffff6633, 0xffcc6633, 0xff996633, 0xff666633, 0xff336633, 0xff006633, 0xffff3333, 0xffcc3333, 0xff993333, 0xff663333, 0xff333333, 0xff003333, 0xffff0033, 0xffcc0033, 0xff990033, 0xff660033, 0xff330033, 0xff000033, 0xffffff00, 0xffccff00, 0xff99ff00, 0xff66ff00, 0xff33ff00, 0xff00ff00, 0xffffcc00, 0xffcccc00, 0xff99cc00, 0xff66cc00, 0xff33cc00, 0xff00cc00, 0xffff9900, 0xffcc9900, 0xff999900, 0xff669900, 0xff339900, 0xff009900, 0xffff6600, 0xffcc6600, 0xff996600, 0xff666600, 0xff336600, 0xff006600, 0xffff3300, 0xffcc3300, 0xff993300, 0xff663300, 0xff333300, 0xff003300, 0xffff0000, 0xffcc0000, 0xff990000, 0xff660000, 0xff330000, 0xff0000ee, 0xff0000dd, 0xff0000bb, 0xff0000aa, 0xff000088, 0xff000077, 0xff000055, 0xff000044, 0xff000022, 0xff000011, 0xff00ee00, 0xff00dd00, 0xff00bb00, 0xff00aa00, 0xff008800, 0xff007700, 0xff005500, 0xff004400, 0xff002200, 0xff001100, 0xffee0000, 0xffdd0000, 0xffbb0000, 0xffaa0000, 0xff880000, 0xff770000, 0xff550000, 0xff440000, 0xff220000, 0xff110000, 0xffeeeeee, 0xffdddddd, 0xffbbbbbb, 0xffaaaaaa, 0xff888888, 0xff777777, 0xff555555, 0xff444444, 0xff222222, 0xff111111];
    let i = 8;
    let chunk;
    const chunks = [];

    while (i < data.byteLength) {
      let id = '';

      for (let j = 0; j < 4; j++) {
        id += String.fromCharCode(data.getUint8(i++, true));
      }

      const chunkSize = data.getUint32(i, true);
      i += 4;
      data.getUint32(i, true);
      i += 4; // childChunks

      if (id === 'SIZE') {
        const x = data.getUint32(i, true);
        i += 4;
        const y = data.getUint32(i, true);
        i += 4;
        const z = data.getUint32(i, true);
        i += 4;
        chunk = {
          palette: DEFAULT_PALETTE,
          size: {
            x: x,
            y: y,
            z: z
          }
        };
        chunks.push(chunk);
        i += chunkSize - 3 * 4;
      } else if (id === 'XYZI') {
        const numVoxels = data.getUint32(i, true);
        i += 4;
        chunk.data = new Uint8Array(buffer, i, numVoxels * 4);
        i += numVoxels * 4;
      } else if (id === 'RGBA') {
        const palette = [0];

        for (let j = 0; j < 256; j++) {
          palette[j + 1] = data.getUint32(i, true);
          i += 4;
        }

        chunk.palette = palette;
      } else {
        // console.log( id, chunkSize, childChunks );
        i += chunkSize;
      }
    }

    return chunks;
  }

}

class VOXMesh extends THREE.Mesh {
  constructor(chunk) {
    const data = chunk.data;
    const size = chunk.size;
    const palette = chunk.palette; //

    const vertices = [];
    const colors = [];
    const nx = [0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1];
    const px = [1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0];
    const py = [0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1];
    const ny = [0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0];
    const nz = [0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0];
    const pz = [0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1];

    function add(tile, x, y, z, r, g, b) {
      x -= size.x / 2;
      y -= size.z / 2;
      z += size.y / 2;

      for (let i = 0; i < 18; i += 3) {
        vertices.push(tile[i + 0] + x, tile[i + 1] + y, tile[i + 2] + z);
        colors.push(r, g, b);
      }
    } // Store data in a volume for sampling


    const offsety = size.x;
    const offsetz = size.x * size.y;
    const array = new Uint8Array(size.x * size.y * size.z);

    for (let j = 0; j < data.length; j += 4) {
      const x = data[j + 0];
      const y = data[j + 1];
      const z = data[j + 2];
      const index = x + y * offsety + z * offsetz;
      array[index] = 255;
    } // Construct geometry


    let hasColors = false;

    for (let j = 0; j < data.length; j += 4) {
      const x = data[j + 0];
      const y = data[j + 1];
      const z = data[j + 2];
      const c = data[j + 3];
      const hex = palette[c];
      const r = (hex >> 0 & 0xff) / 0xff;
      const g = (hex >> 8 & 0xff) / 0xff;
      const b = (hex >> 16 & 0xff) / 0xff;
      if (r > 0 || g > 0 || b > 0) hasColors = true;
      const index = x + y * offsety + z * offsetz;
      if (array[index + 1] === 0 || x === size.x - 1) add(px, x, z, -y, r, g, b);
      if (array[index - 1] === 0 || x === 0) add(nx, x, z, -y, r, g, b);
      if (array[index + offsety] === 0 || y === size.y - 1) add(ny, x, z, -y, r, g, b);
      if (array[index - offsety] === 0 || y === 0) add(py, x, z, -y, r, g, b);
      if (array[index + offsetz] === 0 || z === size.z - 1) add(pz, x, z, -y, r, g, b);
      if (array[index - offsetz] === 0 || z === 0) add(nz, x, z, -y, r, g, b);
    }

    const geometry = new THREE.BufferGeometry();
    geometry.setAttribute('position', new THREE.Float32BufferAttribute(vertices, 3));
    geometry.computeVertexNormals();
    const material = new THREE.MeshStandardMaterial();

    if (hasColors) {
      geometry.setAttribute('color', new THREE.Float32BufferAttribute(colors, 3));
      material.vertexColors = true;
    }

    super(geometry, material);
  }

}

class VOXDataTexture3D extends THREE.DataTexture3D {
  constructor(chunk) {
    const data = chunk.data;
    const size = chunk.size;
    const offsety = size.x;
    const offsetz = size.x * size.y;
    const array = new Uint8Array(size.x * size.y * size.z);

    for (let j = 0; j < data.length; j += 4) {
      const x = data[j + 0];
      const y = data[j + 1];
      const z = data[j + 2];
      const index = x + y * offsety + z * offsetz;
      array[index] = 255;
    }

    super(array, size.x, size.y, size.z);
    this.format = THREE.RedFormat;
    this.minFilter = THREE.NearestFilter;
    this.magFilter = THREE.LinearFilter;
    this.unpackAlignment = 1;
  }

}

THREE.VOXDataTexture3D = VOXDataTexture3D;
THREE.VOXLoader = VOXLoader;
THREE.VOXMesh = VOXMesh;
} )();
